| /* |
| * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef WTF_OwnPtr_h |
| #define WTF_OwnPtr_h |
| |
| #include <wtf/Assertions.h> |
| #include <wtf/Noncopyable.h> |
| #include <wtf/NullPtr.h> |
| #include <wtf/OwnPtrCommon.h> |
| #include <wtf/TypeTraits.h> |
| #include <algorithm> |
| #include <memory> |
| |
| namespace WTF { |
| |
| // Unlike most of our smart pointers, OwnPtr can take either the pointer type or the pointed-to type. |
| |
| template<typename T> class PassOwnPtr; |
| template<typename T> PassOwnPtr<T> adoptPtr(T*); |
| |
| template<typename T> class OwnPtr { |
| #if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES) |
| // If rvalue references are not supported, the copy constructor is |
| // public so OwnPtr cannot be marked noncopyable. See note below. |
| WTF_MAKE_NONCOPYABLE(OwnPtr); |
| #endif |
| public: |
| typedef typename RemovePointer<T>::Type ValueType; |
| typedef ValueType* PtrType; |
| |
| OwnPtr() : m_ptr(0) { } |
| OwnPtr(std::nullptr_t) : m_ptr(0) { } |
| |
| // See comment in PassOwnPtr.h for why this takes a const reference. |
| template<typename U> OwnPtr(const PassOwnPtr<U>& o); |
| |
| #if !COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES) |
| // This copy constructor is used implicitly by gcc when it generates |
| // transients for assigning a PassOwnPtr<T> object to a stack-allocated |
| // OwnPtr<T> object. It should never be called explicitly and gcc |
| // should optimize away the constructor when generating code. |
| OwnPtr(const OwnPtr<ValueType>&); |
| #endif |
| |
| ~OwnPtr() { deleteOwnedPtr(m_ptr); } |
| |
| PtrType get() const { return m_ptr; } |
| |
| void clear(); |
| PassOwnPtr<T> release(); |
| PtrType leakPtr() WARN_UNUSED_RETURN; |
| |
| ValueType& operator*() const { ASSERT(m_ptr); return *m_ptr; } |
| PtrType operator->() const { ASSERT(m_ptr); return m_ptr; } |
| |
| bool operator!() const { return !m_ptr; } |
| |
| // This conversion operator allows implicit conversion to bool but not to other integer types. |
| typedef PtrType OwnPtr::*UnspecifiedBoolType; |
| operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::m_ptr : 0; } |
| |
| OwnPtr& operator=(const PassOwnPtr<T>&); |
| OwnPtr& operator=(std::nullptr_t) { clear(); return *this; } |
| template<typename U> OwnPtr& operator=(const PassOwnPtr<U>&); |
| |
| #if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES) |
| OwnPtr(OwnPtr&&); |
| template<typename U> OwnPtr(OwnPtr<U>&&); |
| |
| OwnPtr& operator=(OwnPtr&&); |
| template<typename U> OwnPtr& operator=(OwnPtr<U>&&); |
| #endif |
| |
| void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); } |
| |
| private: |
| #if !COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES) |
| // If rvalue references are supported, noncopyable takes care of this. |
| OwnPtr& operator=(const OwnPtr&); |
| #endif |
| |
| // We should never have two OwnPtrs for the same underlying object (otherwise we'll get |
| // double-destruction), so these equality operators should never be needed. |
| template<typename U> bool operator==(const OwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; } |
| template<typename U> bool operator!=(const OwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; } |
| template<typename U> bool operator==(const PassOwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; } |
| template<typename U> bool operator!=(const PassOwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; } |
| |
| PtrType m_ptr; |
| }; |
| |
| template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(const PassOwnPtr<U>& o) |
| : m_ptr(o.leakPtr()) |
| { |
| } |
| |
| template<typename T> inline void OwnPtr<T>::clear() |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = 0; |
| deleteOwnedPtr(ptr); |
| } |
| |
| template<typename T> inline PassOwnPtr<T> OwnPtr<T>::release() |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = 0; |
| return adoptPtr(ptr); |
| } |
| |
| template<typename T> inline typename OwnPtr<T>::PtrType OwnPtr<T>::leakPtr() |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = 0; |
| return ptr; |
| } |
| |
| template<typename T> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<T>& o) |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = o.leakPtr(); |
| ASSERT(!ptr || m_ptr != ptr); |
| deleteOwnedPtr(ptr); |
| return *this; |
| } |
| |
| template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<U>& o) |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = o.leakPtr(); |
| ASSERT(!ptr || m_ptr != ptr); |
| deleteOwnedPtr(ptr); |
| return *this; |
| } |
| |
| #if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES) |
| template<typename T> inline OwnPtr<T>::OwnPtr(OwnPtr<T>&& o) |
| : m_ptr(o.leakPtr()) |
| { |
| } |
| |
| template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(OwnPtr<U>&& o) |
| : m_ptr(o.leakPtr()) |
| { |
| } |
| |
| template<typename T> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<T>&& o) |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = o.leakPtr(); |
| ASSERT(!ptr || m_ptr != ptr); |
| deleteOwnedPtr(ptr); |
| |
| return *this; |
| } |
| |
| template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<U>&& o) |
| { |
| PtrType ptr = m_ptr; |
| m_ptr = o.leakPtr(); |
| ASSERT(!ptr || m_ptr != ptr); |
| deleteOwnedPtr(ptr); |
| |
| return *this; |
| } |
| #endif |
| |
| template<typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b) |
| { |
| a.swap(b); |
| } |
| |
| template<typename T, typename U> inline bool operator==(const OwnPtr<T>& a, U* b) |
| { |
| return a.get() == b; |
| } |
| |
| template<typename T, typename U> inline bool operator==(T* a, const OwnPtr<U>& b) |
| { |
| return a == b.get(); |
| } |
| |
| template<typename T, typename U> inline bool operator!=(const OwnPtr<T>& a, U* b) |
| { |
| return a.get() != b; |
| } |
| |
| template<typename T, typename U> inline bool operator!=(T* a, const OwnPtr<U>& b) |
| { |
| return a != b.get(); |
| } |
| |
| template<typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p) |
| { |
| return p.get(); |
| } |
| |
| } // namespace WTF |
| |
| using WTF::OwnPtr; |
| |
| #endif // WTF_OwnPtr_h |